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Problem 1 (20%) Problem 19-1 in Roess, Prassas, McShane, 5th ed. Signals are being installed and timed for three intersections along a major rural arterial. Some relevant data is available for the arterial at the three intersections, as shown in the table below. It may be assumed that sight distances to left-turning vehicles are adequate in all cases. Which movements would likely require protected phasing for LTs, and why? VLT Vo No. of Opposing Avg Speed of Opposing No. of LT Crashes No. of LT Intersection Direction (veh/h) (veh/h) Lanes Traffic in 3 Yrs Lanes Provided 1 EB 100 1,200 3 50 mi/h WB 120 1,400 3 50 mi/h 2 EB 250 1,800 3 40 mi/h WB 220 2,000 3 40 mi/h 10 22 5880 1 1 2 3 EB 85 1,000 3 50 mi/h 3 1 WB 90 1,000 3 50 mi/h 4

Problem 1 (20%) Problem 19-1 in Roess, Prassas, McShane, 5th ed. Signals are being installed and timed for three intersections along a major rural arterial. Some relevant data is available for the arterial at the three intersections, as shown in the table below. It may be assumed that sight distances to left-turning vehicles are adequate in all cases. Which movements would likely require protected phasing for LTs, and why? VLT Vo No. of Opposing Avg Speed of Opposing No. of LT Crashes No. of LT Intersection Direction (veh/h) (veh/h) Lanes Traffic in 3 Yrs Lanes Provided 1 EB 100 1,200 3 50 mi/h WB 120 1,400 3 50 mi/h 2 EB 250 1,800 3 40 mi/h WB 220 2,000 3 40 mi/h 10 22 5880 1 1 2 3 EB 85 1,000 3 50 mi/h 3 1 WB 90 1,000 3 50 mi/h 4

Traffic and Highway Engineering
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter8: Intersection Control
Section: Chapter Questions
Problem 8P
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Problem 1 (20%) Problem 19-1 in Roess, Prassas, McShane, 5th ed. Signals are being installed and timed for three intersections along a major rural arterial. Some relevant data is available for the arterial at the three intersections, as shown in the table below. It may be assumed that sight distances to left-turning vehicles are adequate in all cases. Which movements would likely require protected phasing for LTs, and why? VLT Vo No. of Opposing Avg Speed of Opposing No. of LT Crashes No. of LT Intersection Direction (veh/h) (veh/h) Lanes Traffic in 3 Yrs Lanes Provided 1 EB 100 1,200 3 50 mi/h WB 120 1,400 3 50 mi/h 2 EB 250 1,800 3 40 mi/h WB 220 2,000 3 40 mi/h 10 22 5880 1 1 2 3 EB 85 1,000 3 50 mi/h 3 1 WB 90 1,000 3 50 mi/h 4
Transcribed Image Text:Problem 1 (20%) Problem 19-1 in Roess, Prassas, McShane, 5th ed. Signals are being installed and timed for three intersections along a major rural arterial. Some relevant data is available for the arterial at the three intersections, as shown in the table below. It may be assumed that sight distances to left-turning vehicles are adequate in all cases. Which movements would likely require protected phasing for LTs, and why? VLT Vo No. of Opposing Avg Speed of Opposing No. of LT Crashes No. of LT Intersection Direction (veh/h) (veh/h) Lanes Traffic in 3 Yrs Lanes Provided 1 EB 100 1,200 3 50 mi/h WB 120 1,400 3 50 mi/h 2 EB 250 1,800 3 40 mi/h WB 220 2,000 3 40 mi/h 10 22 5880 1 1 2 3 EB 85 1,000 3 50 mi/h 3 1 WB 90 1,000 3 50 mi/h 4
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